Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing, an electrode assembly, an electrode terminal, and a current collecting member. The housing has a first wall, and the electrode assembly is housed within the housing. The electrode terminal is arranged on the first wall, a first groove is formed in the end, facing the electrode assembly, of the electrode terminal in the thickness direction of the first wall, and the end, deviating from the electrode assembly, of the electrode terminal is connected with the confluence component. The current collecting component is connected to the electrode assembly, and at least part of the current collecting component is contained in the first groove and connected to the bottom of the first groove. The first groove is formed in the end, facing the electrode assembly, of the electrode terminal, a groove and a cover plate for blocking the groove do not need to be arranged at the end, connected with the confluence component, of the electrode terminal, the connection stability of the electrode terminal and the confluence component is improved, and the risk of connection failure occurring in the use process of the electrode terminal and the confluence component is reduced.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. As the core components of new energy vehicles, batteries have high requirements in terms of safety in use and service life. The electrode assembly of the battery cell usually needs to be interconnected with the electrode terminals provided on the outer shell through the current collecting component, and then connected to the current collecting component in the battery through the electrode terminal to realize the input or output of electrical energy of the battery cell. However, the assembly between the current collecting component and the electrode terminal of the battery cell in the prior art is difficult, and the connection stability between the electrode terminal and the current collecting component is poor, which leads to low production efficiency and short service life of the battery cell.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production efficiency and service life of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly, an electrode terminal and a current collecting member; the shell has a first wall; the electrode assembly is accommodated in the shell; the electrode terminal is arranged on the first wall, and a first groove is provided at one end of the electrode terminal facing the electrode assembly along the thickness direction of the first wall, and the end of the electrode terminal facing away from the electrode assembly is used to be connected to a current collecting component; the current collecting member is connected to the electrode assembly, and at least a portion of the current collecting member is accommodated in the first groove and connected to the bottom of the first groove, so as to realize electrical connection between the electrode assembly and the electrode terminal.

[0006] In the above technical solution, a first groove is provided at one end of the electrode terminal facing the electrode assembly in the thickness direction of the first wall, so that the electrode terminal is used to connect with the current collecting component at the bottom of the first groove, and the end of the electrode terminal facing away from the electrode assembly in the thickness direction of the first wall is used to connect with the current collecting component, so that after at least part of the current collecting component is accommodated in the first groove and connected to the bottom of the first groove, the electrical connection between the electrode assembly and the current collecting component can be achieved, that is, the part of the current collecting component accommodated in the first groove is connected to the bottom wall of the first groove. The battery cell adopting this structure can, on the one hand, reduce the thickness of the area where the electrode terminal is used to connect with the current collecting component, which is beneficial to reduce the gap between the electrode terminal and the current collecting component. On the other hand, since the first groove is provided at the end of the electrode terminal facing the electrode assembly, and part of the current collecting component is inserted into the first groove and connected to the electrode terminal, there is no need to provide a groove at the end of the electrode terminal for connection with the current collecting component, and there is no need to connect a cover plate for sealing the groove to the electrode terminal, so that the current collecting component can be directly connected to the electrode terminal, which is beneficial to improving the connection strength and connection stability between the electrode terminal and the current collecting component, so as to reduce the risk of connection failure between the electrode terminal and the current collecting component during use, thereby ensuring the use stability of the battery cell and helping to improve the service life of the battery cell.

[0007] In some embodiments, along the thickness direction of the first wall, the electrode terminal has a first surface farthest away from the electrode assembly, the first surface is used to be connected to the current collecting component, and a connecting portion is formed between the first surface and the bottom surface of the first groove, and the connecting portion is connected to the current collecting component.

[0008] In the above technical solution, the electrode terminal is used to form a connecting portion connected to the current collecting component between the first surface connected to the busbar component and the bottom surface of the first groove, so that the portion of the electrode terminal located between the first surface and the bottom surface of the first groove is connected to the current collecting component, so that the side of the connecting portion away from the current collecting component is a part of the first surface. Therefore, the battery cell adopting this structure is convenient for connecting the electrode terminal to the busbar component, which is conducive to reducing the difficulty of assembly between the electrode terminal and the busbar component. On the other hand, it can effectively increase the area of ​​the region where the electrode terminal and the busbar component are connected to each other, and can effectively improve the structural strength and connection stability of the electrode terminal connecting the current collecting component and the busbar component, so as to further reduce the risk of connection failure between the electrode terminal and the busbar component during use.

[0009] In some embodiments, the first surface is planar.

[0010] In the above technical solution, by setting the first surface of the electrode terminal for connecting to the busbar component to be a plane, the electrode terminal can be easily connected to the busbar component, and the assembly quality between the electrode terminal and the busbar component can be improved.

[0011] In some embodiments, the connection portion is connected to the current collecting member by welding to form a first weld mark, and the first weld mark extends to the first surface along the thickness direction of the first wall.

[0012] In the above technical solution, the first weld mark formed by the mutual welding of the connecting portion and the current collecting member extends to the first surface in the thickness direction of the first wall, so that the connecting portion of the electrode terminal for welding to the current collecting member is flush with the first surface on the side facing away from the current collecting member in the thickness direction of the first wall, thereby effectively increasing the area of ​​the first surface, so as to increase the connection area and contact area between the electrode terminal and the current collecting member, thereby facilitating the connection between the electrode terminal and the current collecting member, reducing the difficulty of assembly, and improving the connection quality between the electrode terminal and the current collecting member.

[0013] In some embodiments, the first surface is used to be welded to the busbar component and form a second weld mark on the first surface, and along the thickness direction of the first wall, the projection of the second weld mark on the first surface does not overlap with the projection of the first weld mark on the first surface.

[0014] In the above technical solution, since the first weld mark and the second weld mark are formed on the first surface of the electrode terminal, by setting the projection of the first weld mark and the projection of the second weld mark in the thickness direction of the first wall to be non-overlapping, the first weld mark and the second weld mark have no intersection area, thereby effectively reducing the mutual influence between the first weld mark and the second weld mark, thereby reducing the risk of melt-through damage to the first weld mark caused by the mutual welding of the electrode terminal and the current collecting component to form the second weld mark, thereby effectively ensuring the connection quality between the electrode terminal and the current collecting component.

[0015] In some embodiments, the second weld mark surrounds the outside of the first weld mark.

[0016] In the above technical solution, the second weld mark is arranged to surround the outside of the first weld mark, that is, the second weld mark is an annular structure and is located outside the first weld mark. This structure, on the one hand, allows sufficient welding area between the connecting portion of the electrode terminal and the current collecting member to ensure the connection strength between the electrode terminal and the current collecting member. On the other hand, since the current collecting member is welded to the electrode terminal first and the current collecting member is welded to the electrode terminal later, the battery cell adopting this structure is conducive to reducing the difficulty of assembling the electrode terminal and the current collecting member.

[0017] In some embodiments, the first wall is provided with a lead-out hole; the electrode terminal includes a main body, a limiting portion and a rivet portion; part of the main body is passed through the lead-out hole, and the first groove is provided on the main body; the limiting portion protrudes from the outer peripheral surface of the main body, and along the thickness direction of the first wall, the limiting portion is located on the side of the first wall away from the electrode assembly; the rivet portion protrudes from the outer peripheral surface of the main body, and along the thickness direction of the first wall, the rivet portion is located on the side of the first wall facing the electrode assembly.

[0018] In the above technical solution, the electrode terminal is provided with a main body portion that is inserted into the lead-out hole, and a stopper portion and a rivet portion are protruding from the outer peripheral surface of the main body portion. The stopper portion and the rivet portion are respectively located on the side of the first wall facing away from the electrode assembly and the side facing the electrode assembly in the thickness direction of the first wall, so as to achieve riveted fixation of the electrode terminal to the first wall. In addition, the first groove and the rivet portion of the electrode terminal of this structure are both located at the end of the electrode terminal facing the electrode assembly, so that the electrode terminal can be riveted from the interior of the battery cell without forming a rivet groove for riveting on the end of the electrode terminal facing away from the electrode assembly, thereby effectively ensuring the connection strength between the electrode terminal and the busbar component.

[0019] In some embodiments, the main body, the limiting portion and the riveting portion are an integrally formed structure.

[0020] In the above technical solution, the main body, the limiting part and the riveted part are arranged as an integrally formed structure, that is, the electrode terminal is an integral structure, so as to improve the structural strength of the electrode terminal, thereby facilitating the improvement of the connection stability and reliability between the electrode terminal and the current collecting component and the current collecting component, so as to reduce the risk of connection failure of the current collecting component and the current collecting component during use, thereby facilitating the stability of the use of the battery cell and improving the service life of the battery cell.

[0021] In some embodiments, along the thickness direction of the first wall, a surface of the limiting portion facing away from the first wall is coplanar with a surface of the main body facing away from the electrode assembly.

[0022] In the above technical solution, by arranging the surface of the limiting portion away from the first wall and the surface of the main body away from the electrode assembly to be coplanar structures, the surface of one end of the electrode terminal away from the electrode assembly is made to be a planar structure as a whole, thereby facilitating the connection between the electrode terminal and the busbar component, which is beneficial to reducing the difficulty of assembly between the electrode terminal and the busbar component; on the other hand, it can effectively increase the area of ​​the region where the electrode terminal and the busbar component are connected to each other, and can effectively improve the structural strength and connection stability of the electrode terminal connecting the collecting component and the busbar component, so as to further reduce the risk of connection failure between the electrode terminal and the busbar component during use.

[0023] In some embodiments, the first groove includes a first groove and a second groove. Along the thickness direction of the first wall, the second groove is provided on the groove bottom surface of the first groove, and the bottom of the second groove is connected to the current collecting member.

[0024] In the above technical solution, the first groove provided on the main body of the electrode terminal includes a first groove and a second groove arranged along the thickness direction of the first wall, and the second groove is provided on the bottom surface of the first groove. This structure facilitates riveting the electrode terminal from the inside of the battery cell to form a riveted portion and a first groove, which is beneficial to reducing the difficulty of assembling the electrode terminal on the first wall.

[0025] In some embodiments, along the thickness direction of the first wall, the limiting portion has a second surface closest to the electrode assembly, the bottom surface of the first groove is farther away from the electrode assembly than the second surface, or the bottom surface of the first groove is flush with the second surface.

[0026] In the above technical solution, by setting the second surface of the limiting portion in the thickness direction of the first wall to be closer to the electrode assembly than the bottom surface of the first groove or flush with the bottom surface of the first groove, the thickness of the connecting portion is thinned and the thickness of the limiting portion is increased, thereby ensuring the structural strength of the limiting portion while reducing the difficulty of connecting the connecting portion and the current collecting component.

[0027] In some embodiments, the current collecting member includes a base and a protrusion; along the thickness direction of the first wall, the base is arranged between the electrode assembly and the first wall, and the base is connected to the electrode assembly; along the thickness direction of the first wall, the protrusion protrudes from the base in a direction away from the electrode assembly, and at least a portion of the protrusion is accommodated in the first groove and connected to the bottom of the first groove.

[0028] In the above technical solution, the current collecting component is provided with a base and a convex portion protruding from the side of the base away from the electrode assembly, and the convex portion is inserted into the first groove and connected to the bottom of the first groove to realize the assembly connection between the current collecting component and the electrode terminal. The current collecting component adopting this structure is convenient for connecting the current collecting component with the electrode terminal, which is beneficial to reducing the difficulty of assembly between the current collecting component and the electrode terminal. On the other hand, the structure in which the convex portion is inserted into the first groove can play a certain guiding and limiting role in the process of mutual assembly of the current collecting component and the electrode terminal, which is beneficial to improving the assembly efficiency and assembly quality between the current collecting component and the electrode terminal.

[0029] In some embodiments, a second groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the protrusion along a thickness direction of the first wall.

[0030] In the above technical solution, a second groove is provided on the side of the current collecting component facing the electrode assembly and corresponding to the position of the convex portion, that is, the convex portion protrudes from the side of the base away from the electrode assembly, and a second groove is formed on the side of the convex portion facing the electrode assembly. The current collecting component adopting such a structure is convenient for forming the convex portion on the current collecting component through stamping and other processes, which is conducive to reducing the manufacturing difficulty of the current collecting component. On the other hand, it can effectively reduce the manufacturing materials of the current collecting component, which is conducive to reducing the manufacturing cost of the battery cell and reducing the weight of the battery cell.

[0031] In some embodiments, the electrode assembly includes a main body and a tab, and along the thickness direction of the first wall, the tab is arranged at one end of the main body facing the first wall, and the tab is connected to the current collecting component; the battery cell also includes a mounting frame, and the mounting frame is arranged between the first wall and the main body, and the current collecting component is installed on the mounting frame.

[0032] In the above technical solution, the battery cell is also provided with a mounting frame, and the mounting frame is located between the first wall and the main body of the electrode assembly in the thickness direction of the first wall. By mounting the current collecting component on the mounting frame, the current collecting component can be fixed and supported. On the one hand, it can reduce the phenomenon of shaking or displacement of the current collecting component during use, thereby helping to reduce the risk of connection failure between the current collecting component and the electrode terminal and the pole ear. On the other hand, when the pole ear of the electrode assembly is connected with the current collecting component and assembled into the outer shell, the current collecting component can be stabilized by the mounting frame, so as to facilitate the assembly and connection of the current collecting component with the electrode terminal provided on the first wall, thereby helping to reduce the assembly difficulty between the current collecting component and the electrode terminal, so as to improve the production efficiency of the battery cell, and to improve the assembly quality between the current collecting component and the electrode terminal, so as to ensure the production quality of the battery cell.

[0033] In some embodiments, a mounting hole is provided on the mounting frame, and the mounting hole passes through the mounting frame along the thickness direction of the first wall; the current collecting component includes a base and a protrusion, and along the thickness direction of the first wall, the base is provided between the electrode assembly and the first wall and is connected to the electrode tab, and the protrusion protrudes from the base in a direction away from the electrode assembly and passes through the mounting hole to be connected to the electrode terminal; wherein, at least a portion of the base is accommodated in the mounting hole.

[0034] In the above technical solution, a mounting hole for accommodating the base of the current collecting component is provided on the mounting frame, and the mounting hole passes through both sides of the mounting frame along the thickness direction of the first wall, so that at least a portion of the base of the current collecting component can be accommodated in the mounting hole, and the protrusion of the current collecting component can be connected to the electrode terminal after passing through the mounting hole, thereby reducing the difficulty of connecting the current collecting component with the electrode terminal and the tab, and at the same time enabling the base of the current collecting component and the mounting frame to share a part of the space in the thickness direction of the first wall, which is beneficial to improving the internal space utilization of the battery cell, and thus can effectively improve the energy density of the battery cell.

[0035] In some embodiments, a slot is provided on the wall surface of the mounting hole, and the base is plugged into the slot.

[0036] In the above technical solution, a slot for inserting the base of the current collecting component is provided on the wall surface of the mounting hole, so that the current collecting component is connected to the wall surface of the mounting hole, thereby fixing the current collecting component on the mounting frame. This structure facilitates accommodating the base of the current collecting component into the mounting hole and assembling the base, which helps to reduce the difficulty of assembling the current collecting component and the mounting frame.

[0037] In some embodiments, there are two current collecting components and two electrode terminals, the mounting frame is provided with two mounting holes, the current collecting components, the mounting holes and the electrode terminals are arranged in a one-to-one correspondence; the electrode assembly has two electrode tabs with opposite polarities, and the two electrode tabs are respectively connected to the two current collecting components.

[0038] In the above technical solution, by setting two current collecting components and two mounting holes provided on the mounting frame, and each current collecting component is assembled into one mounting hole, the mounting frame can simultaneously stabilize two current collecting components with opposite polarities, so as to facilitate the assembly of the two current collecting components with the two electrode terminals.

[0039] In some embodiments, along the thickness direction of the first wall, the mounting bracket has an abutting surface facing the main body, and the abutting surface abuts against the main body.

[0040] In the above technical solution, by pressing the first surface of the mounting frame facing the main body against the main body of the electrode assembly, the main body can provide support for the mounting frame, thereby improving the structural stability of the mounting frame assembled between the main body and the first wall, so as to further alleviate the phenomenon of shaking or displacement of the current collecting component in the outer shell, which is conducive to further improving the connection quality between the current collecting component and the electrode terminal.

[0041] In some embodiments, an avoidance groove is provided on the abutting surface, and the avoidance groove is used to accommodate the tab.

[0042] In the above technical solution, an avoidance groove for accommodating the tab is provided on the first surface of the mounting frame facing the main body to reduce the squeezing of the tab by the mounting frame, thereby helping to reduce the risk of the tab being damaged or inserted upside down into the main body.

[0043] In some embodiments, the battery cell further includes an insulating member; along a thickness direction of the first wall, the insulating member is disposed between the first wall and the mounting frame to insulate and isolate the first wall from the current collecting member.

[0044] In the above technical solution, an insulating member is provided between the first wall and the mounting frame so that the insulating member can insulate the first wall and the current collecting member, thereby reducing the risk of short circuit between the first wall and the current collecting member and improving the safety of the battery cell.

[0045] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and the first wall, the side wall is arranged around the first wall, and along the thickness direction of the first wall, one end of the side wall is connected to the first wall, and the other end is enclosed to form an opening, and the side wall and the first wall jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0046] In the above technical solution, the first wall for mounting the electrode terminal is a wall of the shell arranged opposite to the end cover in the thickness direction of the first wall. This structure enables the first wall equipped with the electrode terminal to be away from the end cover of the shell, so that there is no direct connection between the first wall and the end cover, thereby further reducing the force generated by the pulling or twisting of the electrode terminal by the busbar component acting on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to further reduce the risk of leakage of the battery cell during use.

[0047] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the electrode assembly is received in the receiving cavity; the end cover closes the opening; wherein the end cover is the first wall.

[0048] In the above technical solution, the first wall for installing the electrode terminal is an end cover for closing the opening of the shell. This structure facilitates the assembly of the electrode terminal on the first wall and helps reduce the difficulty of assembly between the current collecting component and the electrode terminal and the electrode assembly, thereby helping to improve the production efficiency of the battery cell.

[0049] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0050] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0053] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0054] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0055] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0056] FIG5 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0057] FIG6 is a partial enlarged view of the battery cell at point A shown in FIG5 ;

[0058] FIG7 is a schematic diagram of connections between electrode terminals, current collecting components, and current collecting parts according to some embodiments of the present application;

[0059] FIG8 is a cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0060] FIG9 is a schematic structural diagram of a current collecting component of a battery cell provided in some embodiments of the present application;

[0061] FIG10 is a cross-sectional view of a current collecting component of a battery cell provided in some embodiments of the present application;

[0062] FIG11 is a schematic diagram illustrating the connection between a current collecting member and a mounting frame of a battery cell according to some embodiments of the present application;

[0063] FIG12 is a schematic structural diagram of a mounting rack for a battery cell provided in some embodiments of the present application;

[0064] FIG13 is a front view of a mounting bracket for a battery cell provided in some embodiments of the present application.

[0065] Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-shell; 2111-first wall; 2111a-lead-out hole; 2112-side wall; 2113-accommodation cavity; 2114-opening; 212-end cover; 22-electrode assembly; 221-main body; 222-electrode tab; 23-electrode terminal; 231-first groove; 2311-first groove; 2312-second groove; 232-connecting portion; 232 1-first weld mark; 233-first surface; 2331-second weld mark; 234-main body; 235-limiting portion; 2351-second surface; 236-rivet portion; 24-collecting component; 241-base; 242-convex portion; 243-second groove; 25-partitioning member; 26-insulating member; 27-sealing member; 28-mounting frame; 281-mounting hole; 282-slot; 283-rest surface; 284-avoidance groove; 30-collecting component; 200-controller; 300-motor; X-thickness direction of the first wall. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0072] The term "plurality" used in this application refers to two or more (including two).

[0073] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0074] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0075] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0076] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0077] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0078] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0079] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0080] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0081] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0083] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0085] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0086] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0087] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0088] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0089] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0090] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0091] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0092] In some embodiments, the electrode assembly is a laminate structure.

[0093] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0094] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0096] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0097] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0098] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0099] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0100] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0101] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0102] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are an important component of today's new energy development. However, with the continuous development of battery technology, higher requirements are also being placed on battery safety performance and service life.

[0103] For general battery cells, the outer shell of the battery cell usually includes a shell and an end cover, and the end cover is covered with the opening of the shell. In order to facilitate the assembly of the battery cell, the electrode terminal is usually riveted to the end cover of the battery cell, so that when the end cover is covered with the shell, the electrode terminal can be welded to the electrode lug of the electrode assembly through the current collecting member provided in the shell to achieve electrical connection between the electrode terminal and the electrode assembly, so as to realize the input or output of electrical energy of the battery cell through the electrode terminal as the output pole of the battery cell, and finally the end cover is connected to the shell.

[0104] The inventors discovered that a busbar component is usually provided in the battery, and by connecting the busbar component to the electrode terminals of the battery cells, multiple battery cells can be connected in series, in parallel or in mixed connection. However, since the electrode terminals need to be assembled on the end covers and the two ends of the electrode terminals need to extend out of the two sides of the end covers, the thickness of the electrode terminals is relatively thick, which greatly increases the difficulty of welding between the electrode terminals and the current collecting components and the busbar component, which is not conducive to improving the production efficiency of the battery.

[0105] In order to solve the problem of the great difficulty in welding between the electrode terminal and the current collecting component and the busbar component, in the prior art, the electrode terminal is usually provided with a split structure, comprising a terminal body and a cover plate. A groove is provided at the end of the terminal body away from the current collecting component to reduce the thickness of the electrode terminal, and the end of the terminal body provided with the groove is riveted to the end cover, thereby reducing the difficulty in welding between the electrode terminal and the current collecting component. The connection relationship between the electrode terminal and the current collecting component is achieved by welding the terminal body to the current collecting component. Thereafter, the cover plate is welded on the side of the terminal body away from the current collecting component so that the cover plate covers the groove, thereby being welded to the busbar component in the battery through the cover plate, thereby achieving the welding connection between the electrode terminal and the busbar component and reducing the difficulty in welding between the electrode terminal and the busbar component. However, during the later use of battery cells with this structure, due to the shaking or movement of the battery cells, the collecting components connected to the cover plate will generate a certain pulling force or torsional force on the cover plate, which can easily lead to connection failure such as weld cracking between the cover plate and the terminal body due to long-term fatigue stress, thereby causing poor stability in the use of the battery cell, so that the battery cell is at risk of failure, which is not conducive to improving the service life of the battery cell.

[0106] Based on the above considerations, and in order to address the issues of low production efficiency and short service life of battery cells, the inventors, after in-depth research, have designed a battery cell comprising a housing, an electrode assembly, electrode terminals, and a current collecting member. The housing has a first wall, and the electrode assembly is housed within the housing. The electrode terminal is disposed on the first wall, and a first groove is provided at the end of the electrode terminal facing the electrode assembly along the thickness direction of the first wall. The end of the electrode terminal facing away from the electrode assembly is used to connect to the current collecting component. The current collecting member is connected to the electrode assembly, and at least a portion of the current collecting member is housed within the first groove and connected to the bottom of the first groove to achieve electrical connection between the electrode assembly and the electrode terminal.

[0107] In a battery cell of this structure, a first groove is provided at one end of the electrode terminal facing the electrode assembly in the thickness direction of the first wall, so that the electrode terminal is used to connect to the current collecting member at the bottom of the first groove, and the electrode terminal is used to connect to the current collecting component at one end facing away from the electrode assembly in the thickness direction of the first wall. Thus, after at least part of the current collecting component is accommodated in the first groove and connected to the bottom of the first groove, electrical connection between the electrode assembly and the current collecting component can be achieved, that is, the part of the current collecting component accommodated in the first groove is connected to the bottom wall of the first groove. On the one hand, a battery cell adopting this structure can reduce the thickness of the area of ​​the electrode terminal used to connect to the current collecting component, which is beneficial to reduce the thickness of the electrode terminal and the collector On the other hand, since the first groove is provided at the end of the electrode terminal facing the electrode assembly, and part of the current collecting member is inserted into the first groove and connected to the electrode terminal, there is no need to provide a groove at the end of the electrode terminal for connection with the current collecting member, and there is no need to connect a cover plate for sealing the groove to the electrode terminal, so that the current collecting member can be directly connected to the electrode terminal, which is beneficial to improving the connection strength and connection stability between the electrode terminal and the current collecting member, so as to reduce the risk of connection failure between the electrode terminal and the current collecting member during use, thereby ensuring the use stability of the battery cell and helping to improve the service life of the battery cell.

[0108] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps address the problem of connection failure between the electrode terminals of the battery cells and the current busbar, which can easily occur, thereby extending the service life of the battery cells.

[0109] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0110] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0111] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0112] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0113] 2 and 3 , FIG2 is an exploded view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0114] The housing 10 is used to provide an assembly space for the battery cells 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space; the first housing body 11 and the second housing body 12 can also be hollow structures with one side open, and the open side of the first housing body 11 covers the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0115] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that the multiple battery cells 20 are connected both in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10. Of course, the battery 100 may also be in the form of a battery module in which multiple battery cells 20 are first connected in series, in parallel, or in a hybrid connection, and the multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form a whole, and then accommodated in the housing 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar 30 (not shown in the figure), which is used to connect to the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0116] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0117] According to some embodiments of the present application, referring to FIG3 and further to FIG4, FIG5, FIG6, and FIG7, FIG4 is an exploded view of a battery cell 20 according to some embodiments of the present application, FIG5 is a cross-sectional view of a battery cell 20 according to some embodiments of the present application, FIG6 is a partial enlarged view of a portion A of the battery cell 20 shown in FIG5, and FIG7 is a schematic diagram of the connection between an electrode terminal 23, a current collecting member 24, and a current bus 30 according to some embodiments of the present application. The present application provides a battery cell 20, comprising a housing 21, an electrode assembly 22, an electrode terminal 23, and a current collecting member 24. The housing 21 has a first wall 2111, and the electrode assembly 22 is accommodated within the housing 21. The electrode terminal 23 is disposed on the first wall 2111. A first groove 231 is provided at the end of the electrode terminal 23 facing the electrode assembly 22 along the thickness direction X of the first wall. The end of the electrode terminal 23 facing away from the electrode assembly 22 is configured to connect to the current bus 30. The current collecting member 24 is connected to the electrode assembly 22 , and at least a portion of the current collecting member 24 is received in the first groove 231 and connected to the bottom of the first groove 231 , so as to electrically connect the electrode assembly 22 and the electrode terminal 23 .

[0118] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0119] In some embodiments, the housing 21 may include a shell 211 and an end cover 212, wherein a accommodating cavity 2113 is formed inside the shell 211, and the accommodating cavity 2113 has an opening 2114, that is, the shell 211 is a hollow structure with one end open, and the end cover 212 covers the opening 2114 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0120] Optionally, the first wall 2111 for mounting the electrode terminal 23 may be the end cap 212, or may be one of the multiple walls of the housing 211. For example, in Figures 4 and 5, the first wall 2111 is the bottom wall of the housing 211 disposed opposite the end cap 212 in the thickness direction X of the first wall. Of course, in other embodiments, the first wall 2111 may also be a side wall 2112 of the housing 211 adjacent to and abutting the end cap 212.

[0121] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 211 , and the housing 211 may be filled with electrolyte. The end cap 212 may then be placed on the opening 2114 of the housing 211 to seal the opening 2114 of the housing 211 .

[0122] The housing 211 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The shape of the housing 211 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the housing 211 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 211 can have a rectangular parallelepiped structure. Of course, the end cap 212 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 211 has a rectangular parallelepiped structure.

[0123] It is understandable that the shell 21 is not limited to the above structure. The shell 21 can also be other structures. For example, the shell 21 includes a shell body 211 and two end covers 212. The shell body 211 is a hollow structure with openings 2114 on opposite sides. One end cover 212 corresponds to an opening 2114 of the shell body 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0124] Optionally, the number of electrode assemblies 22 housed within the housing 21 may be one or more. For example, in FIG4 , there are two electrode assemblies 22, which are stacked along the thickness of the battery cell 20. That is, the two electrode assemblies 22 are stacked along the thickness of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 housed within the housing 21 may also be three, four, five, or six, etc.

[0125] In some embodiments, as shown in FIG. 4 , the battery cell 20 may further include a separator 25 . The separator 25 is wrapped around the outside of the electrode assembly 22 to insulate and isolate the electrode assembly 22 from the housing 21 .

[0126] Illustratively, the separator 25 is an insulating film coated on the outside of the electrode assembly 22 , and the separator 25 may be made of plastic, rubber, silicone, or the like.

[0127] The electrode terminals 23 function to output or input electrical energy from the battery cells 20. Exemplarily, the electrode terminals 23 are integrally formed, i.e., they are formed using an integrated manufacturing process, such as stamping, casting, or extrusion. The electrode terminals 23 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0128] Along the thickness direction X of the first wall, a first groove 231 is provided at one end of the electrode terminal 23 facing the electrode assembly 22, and an end of the electrode terminal 23 away from the electrode assembly 22 is used to be connected to the busbar component 30, that is, in the thickness direction X of the first wall, a first groove 231 is formed at one end of the electrode terminal 23 close to the interior of the battery cell 20, and an end of the electrode terminal 23 away from the interior of the battery cell 20 is used to be connected to the busbar component 30 in the battery 100, so as to realize the input or output of electrical energy of the battery cell 20.

[0129] For example, the materials of the busbar component 30 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0130] In some embodiments, referring to Figures 4 and 6, an outlet hole 2111a is provided on the first wall 2111, and the outlet hole 2111a passes through both sides of the first wall 2111 along the thickness direction X of the first wall. The electrode terminal 23 is passed through the outlet hole 2111a to install the electrode terminal 23 on the first wall 2111. One end of the electrode terminal 23 forms a first groove 231 for inserting the current collecting member 24, and the other end is used to be connected to the collecting component 30 of the battery 100 to realize the input or output of electrical energy of the battery cell 20.

[0131] The electrode terminal 23 is insulated and mounted on the first wall 2111 , that is, no electrical connection is formed between the electrode terminal 23 and the first wall 2111 .

[0132] The current collecting member 24 connects the electrode terminal 23 and the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23. The current collecting member 24 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0133] At least a portion of the current collecting member 24 is received within the first groove 231 and connected to the bottom of the first groove 231. That is, the current collecting member 24 may be entirely or partially received within the first groove 231. In FIG6 , the current collecting member 24 is partially received within the first groove 231 and connected to the bottom of the first groove 231. That is, the bottom of the first groove 231 forms a connecting portion 232 for connecting to the current collecting member 24. In other words, the current collecting member 24 has a portion inserted into the first groove 231, and the portion of the current collecting member 24 inserted into the first groove 231 is connected to the bottom wall of the first groove 231, thereby connecting the current collecting member 24 to the electrode terminal 23.

[0134] Illustratively, the portion of the current collecting member 24 received in the first groove 231 is welded to the connection portion 232 of the electrode terminal 23 , that is, the portion of the current collecting member 24 received in the first groove 231 is welded to the bottom of the first groove 231 .

[0135] Alternatively, in Figures 4 and 5 , there are two electrode terminals 23 and two current collecting members 24, both of which are mounted on the first wall 2111. Each electrode terminal 23 is connected to the electrode assembly 22 via a current collecting member 24 to output the positive and negative electrodes of the battery cell 20. Of course, in other embodiments, the two electrode terminals 23 may also be mounted on different walls of the housing 21.

[0136] In some embodiments, the battery cell 20 may further include a pressure relief mechanism mounted on the housing 21. Alternatively, the pressure relief mechanism may be disposed on the end cap 212 or the housing 211. The pressure relief mechanism is configured to relieve pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0137] Illustratively, the pressure relief mechanism may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0138] By providing a first groove 231 at one end of the electrode terminal 23 facing the electrode assembly 22 in the thickness direction X of the first wall, the electrode terminal 23 is used to connect with the current collecting member 24 at the bottom of the first groove 231, and the end of the electrode terminal 23 facing away from the electrode assembly 22 in the thickness direction X of the first wall is used to connect with the busbar component 30, so that after at least a portion of the current collecting member 24 is accommodated in the first groove 231 and connected to the bottom of the first groove 231, the electrical connection between the electrode assembly 22 and the busbar component 30 can be achieved, that is, the portion of the current collecting member 24 accommodated in the first groove 231 is connected to the bottom wall of the first groove 231. The battery cell 20 adopting this structure can, on the one hand, reduce the thickness of the area where the electrode terminal 23 is used to connect with the current collecting member 24, which is beneficial to reducing the gap between the electrode terminal 23 and the current collecting member. The difficulty of assembling between the components 24 is reduced, which is beneficial to improving the production efficiency of the battery cell 20. On the other hand, since the first groove 231 is provided at the end of the electrode terminal 23 facing the electrode assembly 22, and part of the current collecting component 24 is inserted into the first groove 231 and connected to the electrode terminal 23, there is no need to provide a groove at the end of the electrode terminal 23 used for connection with the busbar component 30, and there is no need to connect a cover plate for sealing the groove to the electrode terminal 23, so that the busbar component 30 can be directly connected to the electrode terminal 23, which is beneficial to improving the connection strength and connection stability between the electrode terminal 23 and the busbar component 30, so as to reduce the risk of connection failure between the electrode terminal 23 and the busbar component 30 during use, thereby ensuring the use stability of the battery cell 20 and helping to improve the service life of the battery cell 20.

[0139] According to some embodiments of the present application, referring to Figures 5, 6, and 7, and further referring to Figure 8, Figure 8 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in some embodiments of the present application. Along the thickness direction X of the first wall, the electrode terminal 23 has a first surface 233 farthest from the electrode assembly 22. The first surface 233 is used to connect to the current collecting component 30. A connecting portion 232 is formed between the first surface 233 and the bottom surface of the first groove 231. The connecting portion 232 is connected to the current collecting member 24.

[0140] In which, along the thickness direction X of the first wall, the electrode terminal 23 has a first surface 233 farthest from the electrode assembly 22 , that is, the first surface 233 is the end surface of the electrode terminal 23 that deviates from and is farthest from the electrode assembly 22 in the thickness direction X of the first wall.

[0141] Illustratively, the busbar component 30 is configured to be welded to the first surface 233 .

[0142] A connecting portion 232 is formed between the first surface 233 and the bottom surface of the first groove 231, that is, the connecting portion 232 is the area of ​​the electrode terminal 23 between the first surface 233 and the bottom surface of the first groove 231, and this area is interconnected with the portion of the current collecting component 24 inserted in the first groove 231. Since the first surface 233 is used to be connected to the current collecting component 30, that is to say, both the current collecting component 24 and the current collecting component 30 can be connected to the connecting portion 232, and the side of the connecting portion 232 facing away from the electrode assembly 22 in the thickness direction X of the first wall is the first surface 233.

[0143] The electrode terminal 23 is used to form a connecting portion 232 connected to the current collecting component 24 between the first surface 233 connected to the busbar component 30 and the bottom surface of the first groove 231, so that the portion of the electrode terminal 23 located between the first surface 233 and the bottom surface of the first groove 231 is connected to the current collecting component 24, so that the side of the connecting portion 232 facing away from the current collecting component 24 is a part of the first surface 233. Therefore, the battery cell 20 adopting this structure is convenient for connecting the electrode terminal 23 with the busbar component 30, which is conducive to reducing the assembly difficulty between the electrode terminal 23 and the busbar component 30. On the other hand, it can effectively increase the area of ​​the region where the electrode terminal 23 and the busbar component 30 are connected to each other, and can effectively improve the structural strength and connection stability of the electrode terminal 23 connecting the current collecting component 24 and the busbar component 30, so as to further reduce the risk of connection failure between the electrode terminal 23 and the busbar component 30 during use.

[0144] According to some embodiments of the present application, referring to FIG. 6 , FIG. 7 and FIG. 8 , the first surface 233 is a plane.

[0145] The first surface 233 is a plane, that is, the end surface of the electrode terminal 23 on the side facing away from the electrode assembly 22 in the thickness direction X of the first wall is a plane. In other words, the surface of the connecting portion 232 on the side facing away from the electrode assembly 22 in the thickness direction X of the first wall is flush with the end surface of the electrode terminal 23 on the side facing away from the electrode assembly 22 in the thickness direction X of the first wall, thereby jointly defining the first surface 233. Of course, in other embodiments, the first surface 233 may also be a curved surface, etc.

[0146] By setting the first surface 233 of the electrode terminal 23 for connecting with the busbar component 30 to be a plane, the connection between the electrode terminal 23 and the busbar component 30 can be facilitated, and the assembly quality between the electrode terminal 23 and the busbar component 30 can be improved.

[0147] According to some embodiments of the present application, as shown in FIG6 and FIG7 , the connection portion 232 is welded to the current collecting member 24 to form a first weld mark 2321 . The first weld mark 2321 extends to the first surface 233 along the thickness direction X of the first wall.

[0148] Among them, the first weld mark 2321 extends to the first surface 233, that is, the side of the connecting portion 232 of the electrode terminal 23 used for welding with the current collecting component 24 in the thickness direction X of the first wall away from the current collecting component 24 is the first surface 233, so that the first weld mark 2321 is formed on the first surface 233 when the connecting portion 232 and the current collecting component 24 are welded to each other.

[0149] Illustratively, the connection portion 232 and the current collecting member 24 are welded together by laser welding.

[0150] The first weld mark 2321 formed by the mutual welding of the connection portion 232 and the current collecting component 24 extends to the first surface 233 in the thickness direction X of the first wall, so that the connection portion 232 of the electrode terminal 23 used for welding to the current collecting component 24 is flush with the first surface 233 on the side away from the current collecting component 24 in the thickness direction X of the first wall, thereby effectively increasing the area of ​​the first surface 233 to increase the connection area and contact area between the electrode terminal 23 and the current collecting component 30, thereby facilitating the connection between the electrode terminal 23 and the current collecting component 30, which is beneficial to reducing the difficulty of assembly and can improve the connection quality between the electrode terminal 23 and the current collecting component 30.

[0151] According to some embodiments of the present application, as shown in Figure 7, the first surface 233 is used to be welded to the busbar component 30 and form a second weld mark 2331 on the first surface 233. Along the thickness direction X of the first wall, the projection of the second weld mark 2331 on the first surface 233 does not overlap with the projection of the first weld mark 2321 on the first surface 233.

[0152] The projection of the second weld mark 2331 on the first surface 233 does not overlap with the projection of the first weld mark 2321 on the first surface 233 , that is, there is no intersection area between the first weld mark 2321 and the second weld mark 2331 .

[0153] Exemplarily, the first surface 233 and the current collecting component 30 are welded together by laser welding.

[0154] Since the first surface 233 of the electrode terminal 23 is formed with a first weld mark 2321 and a second weld mark 2331, by setting the projection of the first weld mark 2321 and the projection of the second weld mark 2331 in the thickness direction X of the first wall to be non-overlapping, the first weld mark 2321 and the second weld mark 2331 have no intersection area, thereby effectively reducing the mutual influence between the first weld mark 2321 and the second weld mark 2331, thereby reducing the melting damage to the first weld mark 2321 caused by the mutual welding of the electrode terminal 23 and the current collecting component 30 to form the second weld mark 2331, thereby effectively ensuring the connection quality between the electrode terminal 23 and the current collecting component 24.

[0155] In some embodiments, as shown in FIG7 , the second weld mark 2331 surrounds the outside of the first weld mark 2321. In other words, the second weld mark 2331 is an annular structure extending along the circumference of the first weld mark 2321 and is located outside the first weld mark 2321.

[0156] By setting the second weld mark 2331 to surround the outside of the first weld mark 2321, this structure allows, on the one hand, a sufficient welding area to be provided between the connecting portion 232 of the electrode terminal 23 and the current collecting component 24 to ensure the connection strength between the electrode terminal 23 and the current collecting component 24; on the other hand, since the current collecting component 24 and the electrode terminal 23 are welded first and the current collecting component 30 and the electrode terminal 23 are welded later, the battery cell 20 adopting this structure is conducive to reducing the difficulty of assembling between the electrode terminal 23 and the current collecting component 30.

[0157] In some embodiments, as shown in FIG. 6 and FIG. 8 , the thickness of the connecting portion 232 is D, satisfying 0.5 mm ≤ D ≤ 5 mm.

[0158] Among them, 0.5mm≤D≤5mm, that is, in the thickness direction X of the first wall, the thickness of the connecting portion 232 ranges from 0.5mm to 5mm, that is, in the thickness direction X of the first wall, the distance between the first surface 233 and the bottom surface of the first groove 231 is from 0.5mm to 5mm.

[0159] For example, the thickness D of the connecting portion 232 may be 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, or 5 mm.

[0160] By setting the thickness of the connecting portion 232 connecting the electrode terminal 23 and the current collecting member 24 to 0.5 mm to 5 mm, on the one hand, the phenomenon of insufficient structural strength of the connecting portion 232 caused by the thin thickness of the connecting portion 232 can be alleviated, so as to reduce the deformation of the connecting portion 232 during the mutual assembly process with the current collecting member 24, thereby helping to improve the connection quality and connection stability between the connecting portion 232 and the current collecting member 24. On the other hand, it can alleviate the phenomenon of excessive difficulty in connecting the connecting portion 232 and the current collecting member 24 caused by the thick thickness of the connecting portion 232.

[0161] According to some embodiments of the present application, referring to Figures 4, 6 and 8, the first wall 2111 is provided with a lead-out hole 2111a. The electrode terminal 23 includes a main body 234, a limiting portion 235 and a rivet portion 236. Part of the main body 234 is inserted into the lead-out hole 2111a, and the first groove 231 is provided in the main body 234. The limiting portion 235 protrudes from the outer peripheral surface of the main body 234, and along the thickness direction X of the first wall, the limiting portion 235 is located on the side of the first wall 2111 away from the electrode assembly 22. The rivet portion 236 protrudes from the outer peripheral surface of the main body 234, and along the thickness direction X of the first wall, the rivet portion 236 is located on the side of the first wall 2111 facing the electrode assembly 22.

[0162] Part of the main body 234 is disposed within the lead-out hole 2111a, and along the thickness direction X of the first wall, the ends of the main body 234 extend beyond the first wall 2111. In the thickness direction X of the first wall, the end surface of the main body 234 facing away from the electrode assembly 22 and the surface of the stopper 235 facing away from the electrode assembly 22 are flush, and the end surface of the main body 234 facing away from the electrode assembly 22 and the surface of the stopper 235 facing away from the electrode assembly 22 jointly define a first surface 233 for connection to the busbar 30 within the battery 100.

[0163] The stopper 235 protrudes from the outer circumference of the main body 234. That is, the stopper 235 is provided on the outer circumference of the main body 234 and extends in a radial direction away from the central axis of the main body 234. It should be noted that the radial direction of the main body 234 is the direction from the outer circumference of the main body 234 toward the central axis of the main body 234, or the direction from the central axis of the main body 234 toward the outer circumference of the main body 234.

[0164] It should be noted that, referring to Figures 7 and 8 , in the embodiment of the present application, the current collecting component 30 is welded to the limiting portion 235 of the electrode terminal 23 to form the second weld mark 2331, so that the second weld mark 2331 is located in the region of the first surface 233 where the limiting portion 235 is located. This structure allows the second weld mark 2331 to be away from the connection portion 232 of the electrode terminal 23 for connecting to the current collecting member 24, thereby reducing the interference caused by the second weld mark 2331 on the connection portion 232. Of course, in other embodiments, the current collecting component 30 may also be welded to the connection portion 232 of the electrode terminal 23 to form the second weld mark 2331, so that the second weld mark 2331 is located in the region of the first surface 233 where the connection portion 232 is located.

[0165] The rivet portion 236 protrudes from the outer circumference of the main body 234. That is, the rivet portion 236 is provided on the outer circumference of the main body 234 and extends radially away from the central axis of the main body 234. It should be noted that the rivet portion 236 is riveted to the electrode terminal 23 from the interior of the battery cell 20, resulting in a portion of the electrode terminal 23 protruding from the outer circumference of the main body 234 and located on the side of the first wall 2111 facing the electrode assembly 22. This portion is the rivet portion 236.

[0166] It should be noted that since the rivet portion 236 is formed by riveting the electrode terminal 23, it forms an integral structure with the main body 234. The stopper 235 and the main body 234 can be integral or separate structures. If the stopper 235 and the main body 234 are integral structures, they can be formed using a casting or stamping process. If the stopper 235 and the main body 234 are separate structures, the stopper 235 can be connected to the outer circumference of the main body 234 using a process such as welding or clamping.

[0167] In some embodiments, as shown in Figures 4 and 6, the battery cell 20 may further include an insulating member 26. Along the thickness direction X of the first wall, a portion of the insulating member 26 is arranged between the first wall 2111 and the riveted portion 236 of the electrode terminal 23 to insulate and isolate the first wall 2111 from the riveted portion 236 of the electrode terminal 23, thereby helping to reduce the risk of short circuit between the electrode terminal 23 and the first wall 2111.

[0168] For example, the insulating member 26 may be made of plastic, rubber, or silicone.

[0169] In which, the battery cell 20 may also include a seal 27, and along the thickness direction X of the first wall, at least a portion of the seal 27 is arranged between the first wall 2111 and the limiting portion 235 to seal the gap between the first wall 2111 and the limiting portion 235 and insulate and isolate the first wall 2111 and the limiting portion 235.

[0170] Exemplarily, the sealing member 27 can be made of various materials, such as plastic, rubber, or silicone.

[0171] Optionally, as shown in Figure 6, along the thickness direction X of the first wall, part of the sealing member 27 extends into the lead-out hole 2111a and is located between the main body 234 and the hole wall surface of the lead-out hole 2111a to seal the gap between the main body 234 and the hole wall surface of the lead-out hole 2111a and insulate and isolate the main body 234 from the hole wall surface of the lead-out hole 2111a.

[0172] Among them, along the thickness direction X of the first wall, the part of the sealing member 27 extending into the lead-out hole 2111a abuts against the side of the insulating member 26 facing the first wall 2111 to enhance the sealing effect of the sealing member 27. On the one hand, it can achieve a better sealing effect on the gap between the main body 234 and the hole wall of the lead-out hole 2111a. On the other hand, it can achieve a better insulating isolation effect to reduce the risk of short circuit between the electrode terminal 23 and the first wall 2111.

[0173] The electrode terminal 23 is provided with a main body 234 that is inserted into the lead-out hole 2111a. A stopper 235 and a rivet 236 are protruding from the outer circumference of the main body 234. The stopper 235 and the rivet 236 are respectively located on the side of the first wall 2111 facing away from the electrode assembly 22 and the side facing the electrode assembly 22 in the thickness direction X of the first wall, so as to achieve riveting and fixing of the electrode terminal 23 to the first wall 2111. In addition, the first groove 231 and the rivet 236 of the electrode terminal 23 of this structure are both located at the end of the electrode terminal 23 facing the electrode assembly 22, so as to facilitate riveting the electrode terminal 23 from the interior of the battery cell 20. There is no need to form a rivet groove for riveting on the end of the electrode terminal 23 facing away from the electrode assembly 22, thereby effectively ensuring the connection strength between the electrode terminal 23 and the busbar 30.

[0174] According to some embodiments of the present application, referring to FIG. 6 and FIG. 8 , the main body portion 234 , the limiting portion 235 and the riveting portion 236 are an integrally formed structure.

[0175] That is to say, the electrode terminal 23 is made by an integrated molding process. For example, the rivet portion 236 is a portion of the electrode terminal 23 that is riveted to protrude from the outer peripheral surface of the main body 234, and the limiting portion 235 and the main body 234 can be formed by a casting or stamping process.

[0176] By setting the main body 234, the limiting portion 235 and the riveted portion 236 as an integrally formed structure, that is, the electrode terminal 23 is an integral structure, so as to improve the structural strength of the electrode terminal 23, thereby helping to improve the connection stability and reliability between the electrode terminal 23 and the current collecting component 24 and the current collecting component 30, so as to reduce the risk of connection failure between the current collecting component 24 and the current collecting component 30 during use, and thus helping to ensure the use stability of the battery cell 20, so as to improve the service life of the battery cell 20.

[0177] In some embodiments, as shown in FIG. 6 , FIG. 7 and FIG. 8 , along the thickness direction X of the first wall, the surface of the limiting portion 235 facing away from the first wall 2111 is coplanar with the surface of the main body 234 facing away from the electrode assembly 22 .

[0178] Among them, the surface of the limiting portion 235 facing away from the first wall 2111 is coplanar with the surface of the main body 234 facing away from the electrode assembly 22, that is, the side of the limiting portion 235 facing away from the first wall 2111 and the side of the main body 234 facing away from the electrode assembly 22 are flush with each other and located in the same plane, so that the surface of the limiting portion 235 facing away from the first wall 2111 and the surface of the main body 234 facing away from the electrode assembly 22 jointly define the first surface 233 of the electrode terminal 23 for connecting to the busbar component 30.

[0179] By arranging the surface of the limiting portion 235 away from the first wall 2111 and the surface of the main body portion 234 away from the electrode assembly 22 to be coplanar structures, the surface of the end of the electrode terminal 23 away from the electrode assembly 22 is made into a planar structure as a whole. On the one hand, it is convenient to connect the electrode terminal 23 with the busbar component 30, which is conducive to reducing the difficulty of assembly between the electrode terminal 23 and the busbar component 30. On the other hand, it can effectively increase the area of ​​the region where the electrode terminal 23 and the busbar component 30 are connected to each other, and can effectively improve the structural strength and connection stability of the electrode terminal 23 connecting the collecting component 24 and the busbar component 30, so as to further reduce the risk of connection failure between the electrode terminal 23 and the busbar component 30 during use.

[0180] According to some embodiments of the present application, please continue to refer to Figures 6 and 8. The first groove 231 includes a first groove 2311 and a second groove 2312. Along the thickness direction X of the first wall, the second groove 2312 is arranged at the bottom surface of the first groove 2311, and the bottom of the second groove 2312 is connected to the current collecting component 24, that is, the electrode terminal 23 forms a connecting portion 232 connected to the current collecting component 24 at the bottom of the second groove 2312.

[0181] Among them, the second groove 2312 is arranged on the bottom surface of the first groove 2311, that is, the radial size of the first groove 2311 in the main body 234 is larger than the size of the second groove 2312, so that the second groove 2312 can be recessed on the bottom surface of the first groove 2311, so that the first groove 2311 and the second groove 2312 are arranged along the thickness direction X of the first wall, and the first groove 2311 is closer to the electrode assembly 22 than the second groove 2312, that is, the first groove 231 jointly defined by the first groove 2311 and the second groove 2312 is a stepped groove structure.

[0182] It should be noted that the first groove 2311 is a rivet groove formed when the electrode terminal 23 is riveted to form the rivet portion 236 .

[0183] The first groove 231 provided on the main body 234 of the electrode terminal 23 includes a first groove 2311 and a second groove 2312 arranged along the thickness direction X of the first wall, and the second groove 2312 is provided on the bottom surface of the first groove 2311. This structure facilitates riveting the electrode terminal 23 from the inside of the battery cell 20 to form the riveted portion 236 and the first groove 2311, which is beneficial to reducing the difficulty of assembling the electrode terminal 23 on the first wall 2111.

[0184] According to some embodiments of the present application, as shown in Figures 6 and 8, along the thickness direction X of the first wall, the limiting portion 235 has a second surface 2351 closest to the electrode assembly 22, and the bottom surface of the first groove 231 is farther away from the electrode assembly 22 than the second surface 2351, or the bottom surface of the first groove 231 is flush with the second surface 2351.

[0185] In which, along the thickness direction X of the first wall, the limiting portion 235 has a second surface 2351 closest to the electrode assembly 22, that is, the second surface 2351 is the surface of the limiting portion 235 facing and closest to the electrode assembly 22 in the thickness direction X of the first wall, and the second surface 2351 is in contact with the sealing member 27.

[0186] The bottom surface of the first groove 231 is further away from the electrode assembly 22 than the second surface 2351, or the bottom surface of the first groove 231 is flush with the second surface 2351. That is, the bottom surface of the first groove 231 can be further away from the electrode assembly 22 than the second surface 2351, or it can be flush with the second surface 2351. In other words, along the thickness direction X of the first wall, the distance between the bottom surface of the first groove 231 and the electrode assembly 22 can be greater than the distance between the second surface 2351 and the electrode assembly 22, or the bottom surface of the first groove 231 and the second surface 2351 can be in the same plane. For example, in FIG8 , the bottom surface of the first groove 231 is flush with the second surface 2351.

[0187] By setting the second surface 2351 of the limiting portion 235 in the thickness direction X of the first wall to be closer to the electrode assembly 22 or flush with the bottom surface of the first groove 231, the thickness of the connecting portion 232 can be thinned and the thickness of the limiting portion 235 can be increased, thereby ensuring the structural strength of the limiting portion 235 while reducing the difficulty of connecting the connecting portion 232 and the current collecting component 24.

[0188] According to some embodiments of the present application, with reference to Figures 6 and 8, and further with reference to Figure 9, Figure 9 is a schematic structural diagram of the current collecting member 24 of the battery cell 20 provided in some embodiments of the present application. The current collecting member 24 includes a base 241 and a convex portion 242. Along the thickness direction X of the first wall, the base 241 is arranged between the electrode assembly 22 and the first wall 2111, and the base 241 is connected to the electrode assembly 22. Along the thickness direction X of the first wall, the convex portion 242 protrudes from the base 241 in a direction away from the electrode assembly 22, and at least a portion of the convex portion 242 is accommodated in the first groove 231 and connected to the bottom of the first groove 231.

[0189] Among them, the base 241 of the current collecting member 24 is a sheet structure and is arranged between the electrode assembly 22 and the first wall 2111 in the thickness direction X of the first wall to connect the electrode assembly 22, thereby realizing electrical connection between the current collecting member 24 and the electrode assembly 22.

[0190] Along the thickness direction X of the first wall, part of the insulating member 26 is arranged between the first wall 2111 and the base 241 of the current collecting member 24 to insulate and isolate the first wall 2111 and the base 241 of the current collecting member 24, thereby helping to reduce the risk of short circuit between the first wall 2111 and the base 241 of the current collecting member 24.

[0191] The protrusion 242 protrudes from the base 241 in the direction away from the electrode assembly 22 along the thickness direction X of the first wall. That is, the protrusion 242 protrudes from the side of the base 241 facing the electrode terminal 23 in the thickness direction X of the first wall.

[0192] At least a portion of the protrusion 242 is accommodated in the first groove 231 and connected to the bottom of the first groove 231. That is, along the thickness direction X of the first wall, the protrusion 242 is partially inserted into the first groove 231, and the end of the protrusion 242 facing away from the electrode assembly 22 is connected to the groove bottom wall of the first groove 231, so that the protrusion 242 is connected to the connecting portion 232 of the electrode terminal 23. Exemplarily, the protrusion 242 is welded to the connecting portion 232 of the electrode terminal 23, that is, the protrusion 242 and the bottom of the first groove 231 are welded to each other.

[0193] The current collecting component 24 is provided with a base 241 and a convex portion 242 protruding from the side of the base 241 away from the electrode assembly 22, and the convex portion 242 is inserted into the first groove 231 and connected to the bottom of the first groove 231 to realize the assembly connection between the current collecting component 24 and the electrode terminal 23. On the one hand, the current collecting component 24 with such a structure facilitates the connection between the current collecting component 24 and the electrode terminal 23, which is beneficial to reducing the difficulty of assembly between the current collecting component 24 and the electrode terminal 23. On the other hand, the structure in which the convex portion 242 is inserted into the first groove 231 can play a certain guiding and limiting role in the process of mutual assembly of the current collecting component 24 and the electrode terminal 23, which is beneficial to improving the assembly efficiency and assembly quality between the current collecting component 24 and the electrode terminal 23.

[0194] According to some embodiments of the present application, referring to Figures 6 and 9, and further referring to Figure 10, Figure 10 is a cross-sectional view of a current collecting member 24 of a battery cell 20 provided in some embodiments of the present application. Along the thickness direction X of the first wall, a second groove 243 is formed on a side of the current collecting member 24 facing the electrode assembly 22 and corresponding to the position of the protrusion 242.

[0195] Among them, a second groove 243 is formed on the side of the current collecting component 24 facing the electrode assembly 22 and corresponding to the position of the convex portion 242, that is, a cavity is formed inside the recess, and the cavity penetrates the side of the base 241 facing the electrode assembly 22 in the thickness direction X of the first wall to form a second groove 243.

[0196] Illustratively, the current collecting member 24 can be made by stamping or casting to form a protrusion 242 on the base 241 , and a second groove 243 is formed on the side of the current collecting member 24 facing the electrode assembly 22 and corresponding to the protrusion 242 .

[0197] It should be noted that, in other embodiments, the protrusion 242 may also be a solid structure, that is, a solid protrusion 242 is provided on the side of the base 241 away from the electrode assembly 22 in the thickness direction X of the first wall.

[0198] By setting a second groove 243 on the side of the current collecting component 24 facing the electrode assembly 22 and corresponding to the position of the protrusion 242, that is, the protrusion 242 protrudes from the side of the base 241 away from the electrode assembly 22, and a second groove 243 is formed on the side of the protrusion 242 facing the electrode assembly 22, the current collecting component 24 with such a structure is convenient for forming the protrusion 242 on the current collecting component 24 through stamping and other processes, which is conducive to reducing the manufacturing difficulty of the current collecting component 24. On the other hand, it can effectively reduce the manufacturing materials of the current collecting component 24, which is conducive to reducing the manufacturing cost of the battery cell 20 and reducing the weight of the battery cell 20.

[0199] According to some embodiments of the present application, referring to Figures 4 and 6, and further referring to Figure 11, Figure 11 is a schematic diagram illustrating the connection between the current collecting member 24 and the mounting bracket 28 of the battery cell 20 provided in some embodiments of the present application. The electrode assembly 22 includes a main body 221 and a tab 222. Along the thickness direction X of the first wall, the tab 222 is disposed at one end of the main body 221 facing the first wall 2111, and the tab 222 is connected to the current collecting member 24. The battery cell 20 also includes a mounting bracket 28. Along the thickness direction X of the first wall, the mounting bracket 28 is disposed between the first wall 2111 and the main body 221, and the current collecting member 24 is mounted on the mounting bracket 28.

[0200] Among them, the main body 221 of the electrode assembly 22 is the component where the electrochemical reaction occurs in the battery cell 20. The main body 221 of the electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body 221 of the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. The tabs 222 of the electrode assembly 22 are components formed by stacking and connecting the areas on the positive electrode sheet that are not coated with the positive electrode active material layer, or components formed by stacking and connecting the areas on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0201] Along the thickness direction X of the first wall, the tab 222 is provided at one end of the main body 221 facing the first wall 2111 , that is, the tab 222 is formed at one end of the electrode assembly 22 close to the first wall 2111 in the thickness direction X of the first wall.

[0202] The mounting bracket 28 is disposed between the first wall 2111 and the main body 221 in the thickness direction X of the first wall, and serves to provide a fixed installation for the current collecting member 24. The connection between the current collecting member 24 and the mounting bracket 28 can be in various ways, such as clamping, bolting, or bonding. For example, in FIG6 , the mounting bracket 28 is disposed between the insulating member 26 and the main body 221 of the electrode assembly 22 along the thickness direction X of the first wall.

[0203] The mounting frame 28 is made of insulating material, which can be made of various materials, such as plastic, rubber or silicone.

[0204] The battery cell 20 is also provided with a mounting frame 28, and the mounting frame 28 is located between the first wall 2111 and the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall. By installing the current collecting member 24 on the mounting frame 28, the current collecting member 24 can be fixed and supported. On the one hand, it can reduce the phenomenon of shaking or displacement of the current collecting member 24 during use, thereby helping to reduce the risk of connection failure between the current collecting member 24 and the electrode terminal 23 and the pole ear 222. On the other hand, when the pole ear 222 of the electrode assembly 22 is connected with the current collecting member 24 and assembled into the shell 21, the current collecting member 24 can be stabilized by the mounting frame 28, so as to facilitate the assembly and connection between the current collecting member 24 and the electrode terminal 23 set on the first wall 2111, thereby helping to reduce the assembly difficulty between the current collecting member 24 and the electrode terminal 23, thereby improving the production efficiency of the battery cell 20, and helping to improve the assembly quality between the current collecting member 24 and the electrode terminal 23, thereby ensuring the production quality of the battery cell 20.

[0205] According to some embodiments of the present application, as shown in Figures 4, 6, and 11, a mounting hole 281 is provided on the mounting frame 28. The mounting hole 281 extends through the mounting frame 28 along the thickness direction X of the first wall. The current collecting member 24 includes a base 241 and a protrusion 242. Along the thickness direction X of the first wall, the base 241 is disposed between the electrode assembly 22 and the first wall 2111 and is connected to the electrode tab 222. The protrusion 242 protrudes from the base 241 in a direction away from the electrode assembly 22 and passes through the mounting hole 281 to connect to the electrode terminal 23. At least a portion of the base 241 is accommodated in the mounting hole 281.

[0206] The mounting hole 281 passes through the mounting frame 28 along the thickness direction X of the first wall. That is, the mounting hole 281 extends along the thickness direction X of the first wall and passes through both sides of the mounting frame 28 .

[0207] The protrusion 242 protrudes from the base 241 in a direction away from the electrode assembly 22 and passes through the mounting hole 281 to be connected to the electrode terminal 23, that is, along the thickness direction X of the first wall, the protrusion 242 is protruded on the side of the base 241 away from the electrode assembly 22, and the protrusion 242 extends into the first groove 231 and is connected to the bottom of the first groove 231.

[0208] At least a portion of the base 241 is accommodated in the mounting hole 281, that is, the base 241 may be partially accommodated in the mounting hole 281, or the base 241 may be entirely accommodated in the mounting hole 281. For example, in Figures 4 and 6, the base 241 is entirely located in the mounting hole 281 in the thickness direction X of the first wall, and the side of the base 241 facing the electrode assembly 22 is connected to the electrode tab 222.

[0209] For example, in FIG. 11 , the shape of the mounting hole 281 is rectangular. Of course, the shape of the mounting hole 281 is not limited thereto, and the shape of the mounting hole 281 may also be circular, elliptical, pentagonal, or the like.

[0210] By providing a mounting hole 281 on the mounting frame 28 for accommodating the base 241 of the current collecting member 24, and the mounting hole 281 passes through both sides of the mounting frame 28 along the thickness direction X of the first wall, at least a portion of the base 241 of the current collecting member 24 can be accommodated in the mounting hole 281, and the protrusion 242 of the current collecting member 24 can be connected to the electrode terminal 23 after passing through the mounting hole 281, thereby reducing the difficulty of connecting the current collecting member 24 with the electrode terminal 23 and the tab 222 while enabling the base 241 of the current collecting member 24 and the mounting frame 28 to share a part of the space in the thickness direction X of the first wall, which is beneficial to improving the internal space utilization of the battery cell 20, and thus can effectively improve the energy density of the battery cell 20.

[0211] According to some embodiments of the present application, referring to FIG11 and further to FIG12, FIG12 is a schematic structural diagram of a mounting bracket 28 for a battery cell 20 provided in some embodiments of the present application. A slot 282 is provided on the wall of the mounting hole 281, and the base 241 is plugged into the slot 282.

[0212] Part of the base 241 of the current collecting member 24 is inserted into the slot 282 to mount the current collecting member 24 on the mounting frame 28. Of course, in other embodiments, the current collecting member 24 can also be connected to the wall surface of the mounting hole 281 by bonding or screwing to achieve the installation of the current collecting member 24 on the mounting frame 28.

[0213] By providing a slot 282 on the wall surface of the mounting hole 281 for inserting the base 241 of the current collecting component 24, the current collecting component 24 is connected to the wall surface of the mounting hole 281, thereby fixing the current collecting component 24 on the mounting frame 28. This structure facilitates accommodating the base 241 of the current collecting component 24 into the mounting hole 281 and assembling the base 241, which helps to reduce the difficulty of assembling the current collecting component 24 and the mounting frame 28.

[0214] According to some embodiments of the present application, as shown in Figures 4, 11, and 12, there are two current collecting members 24 and two electrode terminals 23. The mounting frame 28 is provided with two mounting holes 281, and the current collecting members 24, mounting holes 281, and electrode terminals 23 are arranged in a one-to-one correspondence. The electrode assembly 22 has two electrode tabs 222 of opposite polarity, and the two electrode tabs 222 are respectively connected to the two current collecting members 24. This allows the mounting frame 28 to simultaneously stabilize the two current collecting members 24 of opposite polarity, facilitating assembly of the two current collecting members 24 with the two electrode terminals 23.

[0215] The electrode assembly 22 has two tabs 222 with opposite polarities, and the two tabs 222 are used to output or input the positive electrode and the negative electrode of the electrode assembly 22 respectively.

[0216] There are two current collecting components 24 and two electrode terminals 23. The current collecting components 24, the mounting holes 281 and the electrode terminals 23 are arranged in a one-to-one correspondence, that is, each current collecting component 24 is connected to an electrode terminal 23, and each current collecting component 24 is accommodated in a mounting hole 281 of the mounting frame 28. The two pole ears 222 are respectively connected to the two current collecting components 24. In other words, the two current collecting components 24 and the two electrode terminals 23 serve as the positive output pole and the negative output pole of the battery cell 20 respectively.

[0217] For example, in Figures 11 and 12, the two mounting holes 281 are arranged along the length direction of the mounting frame 28, and correspondingly, the two current collecting components 24 are arranged at intervals and opposite to each other along the length direction of the mounting frame 28. The length direction of the mounting frame 28 is perpendicular to the thickness direction X of the first wall, so as to facilitate the assembly of the current collecting components 24 and the assembly connection between the current collecting components 24 and the pole ears 222.

[0218] By providing two current collecting members 24 and two mounting holes 281 on the mounting frame 28, and assembling each current collecting member 24 into one mounting hole 281, the mounting frame 28 can simultaneously stabilize two current collecting members 24 with opposite polarities, so as to facilitate the assembly of the two current collecting members 24 with the two electrode terminals 23.

[0219] According to some embodiments of the present application, as shown in FIG. 6 , FIG. 11 and FIG. 12 , along the thickness direction X of the first wall, the mounting frame 28 has an abutting surface 283 facing the main body 221 , and the abutting surface 283 abuts against the main body 221 .

[0220] The mounting frame 28 has abutting surface 283 facing the main body 221 , and the abutting surface 283 abuts against the main body 221 , that is, the mounting frame 28 abuts against the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall.

[0221] By placing the first surface 233 of the mounting frame 28 facing the main body 221 against the main body 221 of the electrode assembly 22, the main body 221 can provide support for the mounting frame 28, thereby improving the structural stability of the mounting frame 28 assembled between the main body 221 and the first wall 2111, thereby further alleviating the phenomenon of shaking or displacement of the current collecting component 24 in the outer shell 21, and further helping to further improve the connection quality between the current collecting component 24 and the electrode terminal 23.

[0222] According to some embodiments of the present application, referring to Figures 11 and 12 and further to Figure 13, which is a front view of a mounting bracket 28 for a battery cell 20 provided in some embodiments of the present application, a relief groove 284 is provided on the abutment surface 283 for accommodating the tab 222.

[0223] Among them, an avoidance groove 284 is provided on the abutting surface 283, that is, the surface of the mounting frame 28 abutting against the main body 221 of the electrode assembly 22 in the thickness direction X of the first wall is provided with an avoidance groove 284, so that the pole ear 222 can be accommodated in the avoidance groove 284 to avoid the pole ear 222.

[0224] Exemplarily, the electrode assembly 22 has two tabs 222 with opposite polarities. Correspondingly, two avoidance grooves 284 are provided on the abutting surface 283 of the mounting frame 28 , and each avoidance groove 284 is used to avoid one tab 222 .

[0225] In some embodiments, as shown in FIG13 , the thickness of the mounting frame 28 in the thickness direction X of the first wall is 1 mm to 10 mm. By setting the thickness of the mounting frame 28 to 1 mm, on the one hand, the problem of insufficient structural strength of the mounting frame 28 due to a too small thickness of the mounting frame 28 can be alleviated, thereby reducing the risk of the mounting frame 28 breaking during assembly or use, and improving the support and stability of the current collecting member 24. On the other hand, the problem of the mounting frame 28 occupying too much internal space of the battery cell 20 due to an excessive thickness of the mounting frame 28 can be alleviated, thereby improving the energy density of the battery cell 20.

[0226] The thickness of the mounting frame 28 in the thickness direction X of the first wall is the distance between the abutting surface 283 of the mounting frame 28 and the surface of the mounting frame 28 facing away from the main body 221 in the thickness direction X of the first wall.

[0227] For example, the thickness of the mounting frame 28 in the thickness direction X of the first wall may be 1 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 8 mm, or 10 mm.

[0228] By providing an avoidance groove 284 for accommodating the tab 222 on the first surface 233 of the mounting frame 28 facing the main body 221 , the extrusion of the tab 222 by the mounting frame 28 is reduced, thereby helping to reduce the risk of the tab 222 being damaged or inserted upside down into the main body 221 .

[0229] According to some embodiments of the present application, as shown in Figures 4 and 6, the battery cell 20 further includes an insulating member 26, which is disposed between the first wall 2111 and the mounting frame 28 along the thickness direction X of the first wall to insulate and isolate the first wall 2111 and the current collecting member 24.

[0230] Among them, part of the insulating part 26 is located at the riveted part 236 between the first wall 2111 and the electrode terminal 23 in the thickness direction X of the first wall, so that when the riveted part 236 of the electrode terminal 23 is riveted and fixed on the first wall 2111, the insulating part 26 can be fastened to the first wall 2111, so as to reduce the shaking phenomenon of the insulating part 26 during use, and the insulating part 26 can play an insulating and isolating role for the riveted part 236 of the electrode terminal 23 and the first wall 2111, so as to reduce the risk of short circuit between the riveted part 236 and the first wall 2111.

[0231] By disposing an insulating member 26 between the first wall 2111 and the mounting frame 28 , the insulating member 26 can insulate the first wall 2111 and the current collecting member 24 , thereby reducing the risk of short circuit between the first wall 2111 and the current collecting member 24 and improving the safety of the battery cell 20 .

[0232] According to some embodiments of the present application, as shown in Figures 3, 4, and 5, the housing 21 includes a shell 211 and an end cap 212. The shell 211 includes an integrally formed side wall 2112 and a first wall 2111. The side wall 2112 is disposed around the first wall 2111. Along the thickness direction X of the first wall, one end of the side wall 2112 is connected to the first wall 2111, and the other end is enclosed to form an opening 2114. The side wall 2112 and the first wall 2111 jointly define a housing cavity 2113 for accommodating the electrode assembly 22. The end cap 212 closes the opening 2114.

[0233] The housing 211 includes an integrally formed sidewall 2112 and a first wall 2111. The sidewall 2112 and first wall 2111 are integrally formed, and the housing 211 is manufactured using an integral molding process such as stamping or casting. This structure of the housing 211 enhances its structural strength, mitigating the risk of cracks in the housing 211 caused by the pulling or twisting of the electrode terminals 23 by the current collector 30, which then transfers force through the electrode terminals 23 to the first wall 2111. This effectively reduces the risk of leakage from the battery cells 20 during use, thereby improving the safety and service life of the battery cells 20.

[0234] Along the thickness direction X of the first wall, one end of the side wall 2112 is connected to the first wall 2111, and the other end encloses an opening 2114. The end cap 212 closes the opening 2114. That is, the first wall 2111 for mounting the electrode terminal 23 is the bottom wall of the housing 211, which is arranged opposite the end cap 212 in the thickness direction X of the first wall. Of course, in other embodiments, the first wall 2111 may also be the side wall 2112 of the housing 211.

[0235] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the outer shell 21 may include a housing 211 and an end cap 212. The housing 211 defines a receiving cavity 2113 with an opening 2114. The electrode assembly 22 is received within the receiving cavity 2113, and the end cap 212 closes the opening 2114. The end cap 212 is a first wall 2111. By configuring the first wall 2111, for mounting the electrode terminal 23, as the end cap 212 for closing the opening 2114 of the housing 211, this structure facilitates assembly of the electrode terminal 23 onto the first wall 2111 and reduces the difficulty of assembling the current collecting member 24 with the electrode terminal 23 and the electrode assembly 22, thereby improving the production efficiency of the battery cell 20. In other words, in this embodiment, the first wall 2111 may also be the end cap 212 of the outer shell 21 that covers the opening 2114 of the housing 211. That is, the electrode terminal 23 is mounted on the end cap 212 of the outer shell 21 of the battery cell 20.

[0236] By setting the first wall 2111 for mounting the electrode terminal 23 as a wall arranged opposite to the end cover 212 in the thickness direction X of the first wall of the shell 211, this structure can make the first wall 2111 equipped with the electrode terminal 23 away from the end cover 212 of the shell 21, so that there is no direct connection between the first wall 2111 and the end cover 212, thereby further reducing the force generated by the pulling or twisting of the electrode terminal 23 by the busbar component 30 acting on the end cover 212, thereby reducing the risk of connection failure between the end cover 212 and the shell 211, and further helping to further reduce the risk of leakage of the battery cell 20 during use.

[0237] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 20 of any of the above solutions.

[0238] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0239] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0240] According to some embodiments of the present application, as shown in Figures 3 to 13, the present application provides a battery cell 20, which includes an outer shell 21, an electrode assembly 22, an electrode terminal 23, a current collecting member 24, and a mounting bracket 28. The outer shell 21 includes a shell 211 and an end cap 212. The shell 211 includes an integrally formed side wall 2112 and a first wall 2111. The side wall 2112 is disposed around the first wall 2111. Along the thickness direction X of the first wall, one end of the side wall 2112 is connected to the first wall 2111, and the other end of the side wall 2112 is enclosed to form an opening 2114. The side wall 2112 and the first wall 2111 together define a receiving cavity 2113. The end cap 212 closes the opening 2114. The electrode assembly 22 is accommodated in the receiving cavity 2113. The electrode assembly 22 includes a main body 221 and a tab 222. Along the thickness direction X of the first wall, the tab 222 is disposed at the end of the main body 221 facing the first wall 2111. The electrode terminal 23 is riveted to the first wall 2111. A first groove 231 is provided at the end of the electrode terminal 23 facing the electrode assembly 22, along the thickness direction X of the first wall. The electrode terminal 23 has a first surface 233, which is farthest from the electrode assembly 22. The first surface 233 is used to connect to the current collecting component 30. A connecting portion 232 is formed between the first surface 233 and the bottom surface of the first groove 231. The first surface 233 is flat. The connecting portion 232 is welded to the current collecting member 24 to form a first weld mark 2321. The first weld mark 2321 extends onto the first surface 233 along the thickness direction X of the first wall. The first wall 2111 is provided with an extraction hole 2111a. The electrode terminal 23 includes an integrally formed body portion 234, a retaining portion 235, and a rivet portion 236. The body portion 234 is disposed within the extraction hole 2111a. The first groove 231 is provided in the body portion 234. The retaining portion 235 protrudes from the outer circumference of the body portion 234. Along the thickness direction X of the first wall, the retaining portion 235 is located on the side of the first wall 2111 facing away from the electrode assembly 22. The rivet portion 236 protrudes from the outer circumference of the body portion 234. Along the thickness direction X of the first wall, the rivet portion 236 is located on the side of the first wall 2111 facing the electrode assembly 22. Along the thickness direction X of the first wall, the surface of the retaining portion 235 facing away from the first wall 2111 is coplanar with the surface of the body portion 234 facing away from the electrode assembly 22, thereby jointly defining a first surface 233 of the electrode terminal 23 for interconnection with the busbar 30. The current collecting member 24 includes a base 241 and a protrusion 242. Along the thickness direction X of the first wall, the base 241 is disposed between the electrode assembly 22 and the electrode terminal 23 and is connected to the tab 222 of the electrode assembly 22. The protrusion 242 protrudes from the base 241 away from the electrode assembly 22. At least a portion of the protrusion 242 is received within the first recess 231 and connected to the connection portion 232. Along the thickness direction X of the first wall, a second recess 243 is formed on the side of the current collecting member 24 facing the electrode assembly 22 and corresponding to the position of the protrusion 242.Along the thickness direction X of the first wall, the mounting bracket 28 is disposed between the first wall 2111 and the main body 221. The mounting bracket 28 is provided with a mounting hole 281 that extends through both sides of the mounting bracket 28 along the thickness direction X of the first wall. A slot 282 is provided on the wall surface of the mounting hole 281. The base 241 of the current collecting member 24 is received in the mounting hole 281 and connected to the tab 222. A portion of the base 241 of the current collecting member 24 is inserted into the slot 282. Along the thickness direction X of the first wall, the mounting bracket 28 has an abutting surface 283 facing the main body 221. The abutting surface 283 abuts the main body 221 and is provided with an escape groove 284 for accommodating the tab 222.

[0241] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0242] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a first wall; an electrode assembly housed in the housing; an electrode terminal disposed on the first wall, wherein a first groove is disposed at one end of the electrode terminal facing the electrode assembly along the thickness direction of the first wall, and an end of the electrode terminal facing away from the electrode assembly is used to connect to the busbar component; as well as A current collecting member is connected to the electrode assembly, and at least a portion of the current collecting member is accommodated in the first groove and connected to the bottom of the first groove, so as to achieve electrical connection between the electrode assembly and the electrode terminal.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the first wall, the electrode terminal has a first surface farthest away from the electrode assembly, the first surface is used to be connected to the current collecting component, a connecting portion is formed between the first surface and the bottom surface of the first groove, and the connecting portion is connected to the current collecting component.

3. The battery cell according to claim 2, wherein: The first surface is a plane.

4. The battery cell according to claim 2 or 3, wherein: The connecting portion is connected to the current collecting member by welding to form a first weld mark. The first weld mark extends to the first surface along a thickness direction of the first wall.

5. The battery cell according to claim 4, wherein: The first surface is used to be welded to the busbar component and form a second weld mark on the first surface. Along the thickness direction of the first wall, the projection of the second weld mark on the first surface does not overlap with the projection of the first weld mark on the first surface. The battery cell according to claim 5 , wherein: The second weld mark surrounds the outer side of the first weld mark.

7. The battery cell according to any one of claims 1 to 6, wherein: The first wall is provided with an outlet hole; The electrode terminal includes: A main body portion is partially inserted into the lead-out hole, and the first groove is provided in the main body portion; a limiting portion protruding from the outer peripheral surface of the main body portion and located on a side of the first wall away from the electrode assembly along the thickness direction of the first wall; The rivet portion protrudes from the outer peripheral surface of the main body portion and is located along the thickness direction of the first wall on a side of the first wall facing the electrode assembly.

8. The battery cell according to claim 7, wherein: The main body, the limiting portion and the riveting portion are an integrally formed structure.

9. The battery cell according to claim 7 or 8, wherein: Along the thickness direction of the first wall, a surface of the limiting portion facing away from the first wall is coplanar with a surface of the main body facing away from the electrode assembly.

10. The battery cell according to claim 8 or 9, wherein: The first groove includes a first groove and a second groove. Along the thickness direction of the first wall, the second groove is provided on the groove bottom surface of the first groove, and the bottom of the second groove is connected to the current collecting member.

11. The battery cell according to any one of claims 8 to 10, wherein: Along the thickness direction of the first wall, the limiting portion has a second surface closest to the electrode assembly, the bottom surface of the first groove is farther away from the electrode assembly than the second surface, or the bottom surface of the first groove is flush with the second surface.

12. The battery cell according to any one of claims 1 to 11, wherein: The current collecting component comprises: a base portion, arranged along a thickness direction of the first wall between the electrode assembly and the first wall, and connected to the electrode assembly; A convex portion protrudes from the base portion in a direction away from the electrode assembly along the thickness direction of the first wall, and at least a portion of the convex portion is accommodated in the first groove and connected to the bottom of the first groove.

13. The battery cell according to claim 12, wherein: A second groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the convex portion along a thickness direction of the first wall.

14. The battery cell according to any one of claims 1 to 13, wherein: The electrode assembly includes a main body and a tab. The tab is provided at one end of the main body facing the first wall along the thickness direction of the first wall, and the tab is connected to the current collecting member. The battery cell further includes a mounting frame disposed between the first wall and the main body, and the current collecting member is mounted on the mounting frame.

15. The battery cell according to claim 14, wherein: The mounting frame is provided with a mounting hole, and the mounting hole passes through the mounting frame along the thickness direction of the first wall; The current collecting member includes a base and a protrusion. Along the thickness direction of the first wall, the base is disposed between the electrode assembly and the first wall and connected to the electrode tab. The protrusion protrudes from the base in a direction away from the electrode assembly and passes through the mounting hole to be connected to the electrode terminal. Wherein, at least a portion of the base is accommodated in the mounting hole.

16. The battery cell according to claim 15, wherein: A slot is provided on the hole wall surface of the mounting hole, and the base is plugged into the slot.

17. The battery cell according to claim 15 or 16, wherein: There are two current collecting members and two electrode terminals, the mounting frame is provided with two mounting holes, and the current collecting members, the mounting holes and the electrode terminals are provided in a one-to-one correspondence; The electrode assembly has two electrode tabs with opposite polarities, and the two electrode tabs are respectively connected to the two current collecting members.

18. The battery cell according to any one of claims 14 to 17, wherein: The mounting bracket has a contact surface facing the main body along a thickness direction of the first wall, and the contact surface contacts the main body.

19. The battery cell according to claim 18, wherein: The abutting surface is provided with an avoidance groove, and the avoidance groove is used to accommodate the tab.

20. The battery cell according to any one of claims 14 to 19, wherein: The battery cell further comprises: An insulating member is provided between the first wall and the mounting frame along a thickness direction of the first wall to insulate and isolate the first wall from the current collecting member.

21. The battery cell according to any one of claims 1 to 20, wherein: The housing comprises: a housing comprising an integrally formed side wall and the first wall, the side wall being disposed around the first wall, one end of the side wall being connected to the first wall along the thickness direction of the first wall, and the other end of the side wall being enclosed to form an opening, the side wall and the first wall jointly defining a housing cavity for accommodating the electrode assembly; An end cap closes the opening.

22. The battery cell according to any one of claims 1 to 20, wherein: The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cap for closing the opening; Wherein, the end cover is the first wall.

23. A battery comprising the battery cell according to any one of claims 1 to 22.

24. An electrical device comprising the battery according to claim 23.

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